Fixed bug: listener callback was changing SRTO_GROUPCONNECT option. #1491
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Fixes #1490
Problem: the SRTO_GROUPCONNECT option was changed in the listener callback wrapper function basing on the found group extension. This was overwriting the value derived from the listener, and the group interpreter was relying on that value.
Solution: before setting the option, first check if you have group extension, but groupconnect=0. If this is found, reject the connection prematurely, without calling the listener callback.